Parametric Analysis of Spectral Fano Lineshape for Plasmonic Waveguide-Coupled Dual Nanoresonator
TL;DR: In this paper, the phase dependent resonant behavior along with its complex plane analysis is investigated in the wavelength regime, and the theoretical analysis of differential phase sensitivity in wavelength regime predicts the possibility of detection of refractive index change of the order of 10 −8 RIU.
Abstract: Numerical investigations of metal–dielectric–metal waveguide-coupled dual nanoresonator is demonstrated. Phase dependent resonant behavior along with its complex plane analysis is investigated in wavelength regime. Detailed analysis of the influence of the structural parameters on the resonance curve helps to determine the correct device parameters for different plasmonic applications. This waveguide-coupled plasmonic resonator can be utilized for chemical and biological sensing. In this context, figure of merit related to the asymmetric Fano line shape is redefined, incorporating both differential phase and quality (Q)-factor. Theoretical analysis of differential phase sensitivity in wavelength regime predicts the possibility of detection of refractive index change of the order of 10 −8 RIU.
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TL;DR: In this paper, an all-optical plasmonic switch based on metal-insulator-metal (MIM) nanoplasmonics waveguide with a Kerr nonlinear ring resonator is introduced and studied.
52 citations
TL;DR: In this paper, a ring-groove (RG) joint metal-insulator-metal (MIM) waveguide was proposed for the biochemistry sensing area, which achieved high figure of merit and high refractive-index sensitivity.
Abstract: Though adding a groove to a plasmonic end-coupled perfect ring (PR) resonator, two additional resonance modes, which can be controlled by the length of the groove, will arise in this proposed ring-groove (RG) joint metal-insulator-metal (MIM) waveguide. By further cascading, the PR resonator and the RG joint resonator, single and dual Fano resonances with asymmetric line shapes are obtained due to the interference effects between the dark modes and the bright modes. High figure of merit and high refractive-index sensitivity are achieved, and thus this structure is suitable for the biochemistry sensing area. Interestingly, normal and abnormal dispersions are also investigated for the Fano peaks and dips, respectively. The performances of the proposed structure are investigated by using the finite-difference time-domain method.
36 citations
TL;DR: An end-coupled hexagonal resonator inserted with dual parallel metallic blocks is proposed based on subwavelength metal-insulator-metal waveguides that can highly support the development of integrated photonics and find wide applications in the on-chip optical filtering and sensing areas.
Abstract: In this paper, an end-coupled hexagonal resonator inserted with dual parallel metallic blocks is proposed based on subwavelength metal-insulator-metal waveguides. When the blocks are vertically inserted into the resonator, more transmission channels (three peaks) with symmetrical spectral shapes than that (one peak) of the perfect hexagonal resonator are achieved in the same wavelength range. The transmission peaks all have high transmittances; thus, the structure can be performed as an on-chip optical filter. When the blocks are horizontally distributed in the resonator, the antinode and node of the magnetic field for the expected mode will arise inside and outside the blocks, leading to the mode interactions. Subsequently, Fano resonance with an asymmetrical peak is achieved in the structure. High index sensitivity and high figure of merit, which are significant factors for optical sensors, are investigated by using the finite-difference time-domain method. The proposed structure can highly support the development of integrated photonics and find wide applications in the on-chip optical filtering and sensing areas.
26 citations
TL;DR: In this paper, a plasmonic waveguide-coupled resonator was used to achieve optical switching simultaneously at two and three wavelengths at higher intensities, respectively.
Abstract: Plasmon-induced transparency, an effect analogous to electromagnetically induced transparency in atomic systems, is investigated theoretically in a plasmonic waveguide-coupled resonator device. Transmittance peak is induced through modulation of an external control beam, which alters the nonlinear optical response of a third-order Kerr medium incorporated within the structure. This induced transparency is utilized to achieve optical switching simultaneously at two wavelengths. At higher intensities, an induced peak exhibiting Fano resonant feature enables demonstration of simultaneous switching at three wavelengths. The performance of the switch is evaluated by determining the differential transmittance at the switching wavelengths.
21 citations
TL;DR: In this paper, a plasmonic waveguide-coupled resonator with a third-order Kerr nonlinear medium was investigated for multispectral optical switching at four or more wavelengths.
Abstract: Quantum interference effects, namely Fano resonance producing asymmetric resonant excitation and plasmon-induced transparency (PIT), are demonstrated in a plasmonic waveguide-coupled resonator device incorporated with a third-order Kerr nonlinear medium. Occurrence of both Fano and induced transparency peaks is modulated by alteration of the nonlinear permittivity through an external control beam and the phenomenon is further utilized to investigate optical switching in the plasmonic device. Simultaneous switching at multiple wavelengths is explored using Fano and PIT effect and the multispectral optical switching at four or more wavelengths is employed for proposed realization of trinary logic operations.
17 citations
References
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TL;DR: In this paper, a theoretical analysis of the shape of the 2s2p^{1}P resonance of He observed in the inelastic scattering of electrons is presented. But the analysis is restricted to the case of one discrete level with two or more continua and of a set of discrete levels with one continuum.
Abstract: The interference of a discrete autoionized state with a continuum gives rise to characteristically asymmetric peaks in excitation spectra. The earlier qualitative interpretation of this phenomenon is extended and revised. A theoretical formula is fitted to the shape of the $2s2p^{1}P$ resonance of He observed in the inelastic scattering of electrons. The fitting determines the parameters of the $2s2p^{1}P$ resonance as follows: $E=60.1$ ev, $\ensuremath{\Gamma}\ensuremath{\sim}0.04$ ev, $f\ensuremath{\sim}2 \mathrm{to} 4\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}3}$. The theory is extended to the interaction of one discrete level with two or more continua and of a set of discrete levels with one continuum. The theory can also give the position and intensity shifts produced in a Rydberg series of discrete levels by interaction with a level of another configuration. The connection with the nuclear theory of resonance scattering is indicated.
8,210 citations
"Parametric Analysis of Spectral Fan..." refers background in this paper
...Such a resonance phenomena was discovered by Ugo Fano in 1961 while studying the autoionising states of atoms [1]....
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TL;DR: The steep dispersion of the Fano resonance profile promises applications in sensors, lasing, switching, and nonlinear and slow-light devices.
Abstract: Since its discovery, the asymmetric Fano resonance has been a characteristic feature of interacting quantum systems. The shape of this resonance is distinctively different from that of conventional symmetric resonance curves. Recently, the Fano resonance has been found in plasmonic nanoparticles, photonic crystals, and electromagnetic metamaterials. The steep dispersion of the Fano resonance profile promises applications in sensors, lasing, switching, and nonlinear and slow-light devices.
3,536 citations
"Parametric Analysis of Spectral Fan..." refers background in this paper
...Recently asymmetric Fano resonances have evoked enormous interest in the field of plasmonics and metamaterials at nanoscale order [3]....
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TL;DR: In this paper, the authors introduce the concept of Fano resonances, which can be reduced to the interaction of a discrete (localized) state with a continuum of propagation modes, and explain their geometrical and/or dynamical origin.
Abstract: Modern nanotechnology allows one to scale down various important devices (sensors, chips, fibers, etc.) and thus opens up new horizons for their applications. The efficiency of most of them is based on fundamental physical phenomena, such as transport of wave excitations and resonances. Short propagation distances make phase-coherent processes of waves important. Often the scattering of waves involves propagation along different paths and, as a consequence, results in interference phenomena, where constructive interference corresponds to resonant enhancement and destructive interference to resonant suppression of the transmission. Recently, a variety of experimental and theoretical work has revealed such patterns in different physical settings. The purpose of this review is to relate resonant scattering to Fano resonances, known from atomic physics. One of the main features of the Fano resonance is its asymmetric line profile. The asymmetry originates from a close coexistence of resonant transmission and resonant reflection and can be reduced to the interaction of a discrete (localized) state with a continuum of propagation modes. The basic concepts of Fano resonances are introduced, their geometrical and/or dynamical origin are explained, and theoretical and experimental studies of light propagation in photonic devices, charge transport through quantum dots, plasmon scattering in Josephson-junction networks, and matter-wave scattering in ultracold atom systems, among others are reviewed.
2,520 citations
"Parametric Analysis of Spectral Fan..." refers background in this paper
...The asymmetry originates from the interference of two states: a discrete resonant state (excited state) and a continuum of states, such that the energy of the discrete state must lie in the energy band of the continuum sates [2]....
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TL;DR: A theory of the Fano resonance for optical resonators, based on a temporal coupled-mode formalism, is presented and it is shown that the coupling constants in such a theory are strongly constrained by energy-conservation and time-reversal symmetry considerations.
Abstract: We present a theory of the Fano resonance for optical resonators, based on a temporal coupled-mode formalism. This theory is applicable to the general scheme of a single optical resonance coupled with multiple input and output ports. We show that the coupling constants in such a theory are strongly constrained by energy-conservation and time-reversal symmetry considerations. In particular, for a two-port symmetric structure, Fano-resonant line shape can be derived by using only these symmetry considerations. We validate the analysis by comparing the theoretical predictions with three-dimensional finite-difference time-domain simulations of guided resonance in photonic crystal slabs. Such a theory may prove to be useful for response-function synthesis in filter and sensor applications.
1,223 citations
TL;DR: A metallic nanostructure consisting of a disk inside a thin ring that enables a coupling between plasmon modes of differing multipolar order, resulting in a tunable Fano resonance.
Abstract: A metallic nanostructure consisting of a disk inside a thin ring supports superradiant and very narrow subradiant modes. Symmetry breaking in this structure enables a coupling between plasmon modes of differing multipolar order, resulting in a tunable Fano resonance. The LSPR sensitivities of the subradiant and Fano resonances are predicted to be among the largest yet for individual nanostructures.
992 citations
"Parametric Analysis of Spectral Fan..." refers methods in this paper
...Asymmetric resonances have been widely used in the characterization of nanoscale photonic devices like plasmonic nanostructures [5], nanocavities [6], [7], metamaterials [8], nanohole...
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